<div style="text-align: center">
    <header>
        <h1>Who was the first president of the united states?</h1>
    </header>
    <nav>
        <p>
        <div id="play">

            <div id="demo">
                <table>
                    <tr><td onclick="alert('wrong answer')">John Quincy Adams</td></tr>
                    <tr><td onclick="window.top.document.getElementById('blocker').style.display = 'none'">George Washington</td></tr>
                    <tr><td onclick="alert('wrong answer')">John Tyler</td></tr>
                </table>
            </div>

        </div>
        </p>
    </nav>

</div>
